I can't use the 3d manipulator
In my experience (my laptop has this issue) it's a problem with OpenGL implementation affecting the selection. This causes dragging the manipulator to result in repositioning the 3D cursor instead of manipulating the object. 

To resolve this you need to change the Selection option in the System tab of the User Preferences :



In my case, changing from 'Automatic' to 'OpenGL Select' resolves the issue.